Searched for: subject%3A%22Ultrasound%22
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Li, J. (author)
Around 10% of the population will have to go through a catheterization procedure for the treatment of a cardiovascular disease at a certain stage of their lives. During such a procedure, smart catheters will be the "eyes and ears" of the surgeons, significantly improving the diagnosis and treatment. However, there have been very limited...
doctoral thesis 2024
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Kawasaki, S. (author)
CMUTs (Capacitive Micromachined Ultrasonic Transducers) are causing a technological revolution. Research over the last decade showed that CMUTs can sufficiently replace traditional ultrasound technology based on the bulk PZT, along with other benefits such as lower assembly cost, broader bandwidth and monolithic integration capability with ASICs...
doctoral thesis 2024
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Guo, P. (author)
This thesis presents the design and implementation of integrated ultrasound transceivers for use in transfontanelle ultrasonography (TFUS). Two generations of ultrasound transceiver ASICs integrated with PZT transducer arrays intended for TFUS are presented. In the first generation, a novel AFE design that combines an LNA with the continuous TGC...
doctoral thesis 2023
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Ossenkoppele, B.W. (author)
High-frame-rate volumetric ultrasound imaging is highly desired to enable novel clinical ultrasound applications. However, realizing high-quality volumetric ultrasound imaging at a high frame rates (>500 Hz) is challenging. Keeping the cable count and data rate of the transducer device at a realistic level without sacrificing image quality to...
doctoral thesis 2023
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Hopf, Y.M. (author)
This thesis describes the design of application-specific integrated circuits (ASICs) for high-frame-rate 3D intracardiac echocardiography (ICE) probes. The work follows the whole process from the analysis of the application to the testing of a prototype with all envisioned functionality. It starts with the evaluation of the main challenges posed...
doctoral thesis 2023
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van der Meulen, P.Q. (author)
Whereas aberrating layers are typically viewed as an impediment to medical ultrasound imaging, they can, surprisingly, also be used to our benefit. As long as we can model the effect of an aberrating layer, we can utilize ‘model-based imaging’, the imaging technique explored throughout this thesis, to reconstruct ultrasound images where...
doctoral thesis 2023
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van Willigen, D.M. (author)
This thesis describes the design, prototyping and evaluation of matrix-based clamp-on ultrasonic flow meters. Several new measurement techniques are presented as well as an Application-Specific Integrated Circuit (ASIC) designed for accurate measurement of flow velocity with matrix transducers.<br/><br/>The influence of circuit topologies on the...
doctoral thesis 2022
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Tan, M. (author)
This thesis describes the design, prototyping and experimental evaluation of transceiver ASICs (application-specific integrated circuits) for catheter-based ultrasound probes and wearable ultrasound patches. To reduce the loading effect of micro-coaxial cables in an ICE probe based on capacitive micro-machined ultrasound transducers (CMUTs), an...
doctoral thesis 2022
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Dash, A. (author)
Suspensions are of interest for curiosity-driven as well as applied research. From a fundamental perspective, inertia of the particles or the system triggers different behaviour in suspension flows. From an experimental perspective, analyzing suspensions is challenging due to their inherent opacity. This dissertation details the author's...
doctoral thesis 2022
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Sabbadini, A. (author)
Diastolic heart failure is one of the principal causes of death in Western countries, and there is currently no treatment available; prevention, on the other hand, may be possible, provided an early enough diagnosis. The worsening of diastolic functionality is associated with increased values of cardiac stiffness, which could therefore provide a...
doctoral thesis 2021
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Massaad Mouawad, J.M. (author)
Ultrasonic flow meters are widely applied to measure flow in a variety of applications. The vast majority of ultrasonic flow meters are based on the measurement of the transit time of an acoustic pulse through the fluid. This can either be done in-line, by inserting a spool piece with ultrasonic transducers into the pipe carrying the fluid, or...
doctoral thesis 2021
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Ouyang, B. (author)
Ultrasound sensors based on integrated photonics devices provide a new solution to meet the miniaturization demand for the detection functionality of transducers. An important example is the silicon ring-resonator (RR) ultrasound sensor developed in our department. This sensor combines a small footprint with high sensitivity and a low detection...
doctoral thesis 2020
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Cuijpers, C.F. (author)
The transjugular intrahepatic portosystemic shunt (TIPS) procedure is one of the most technically challenging procedures in interventional radiology. During the procedure, interventional radiologists (IRs) insert very thin and long instruments through a little incision in the patient’s neck. They then navigate the instruments through the blood...
doctoral thesis 2015
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Ozmen, N. (author)
The main focus of this thesis is on modeling acoustic wavefield propagation and implementing imaging algorithms for breast cancer detection using ultrasound. As a starting point, we use an integral equation formulation, which can be used to solve both the forward and inverse problems. This thesis contains three main topics: forward modeling,...
doctoral thesis 2014
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Bolsterlee, B. (author)
Insight into the mechanical interaction between muscles and bones can be of great help to understand normal function of the human body and to improve diagnoses and treatments of musculoskeletal disorders. This research presented in this thesis aims to improve the predictions of a musculoskeletal model of the shoulder and elbow (the Delft...
doctoral thesis 2014
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Westerveld, W.J. (author)
We demonstrated that photonic micro-ring resonators can be used in micro-machined ultrasound microphones. This might cause a breakthrough in array transducers for ultrasonography; first because optical multiplexing allows array interrogation via one optical fiber and second because the silicon-on-insulator technology allows cost-effective...
doctoral thesis 2014
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Sanaee, S.A. (author)
This thesis is dedicated to an investigation of the potential and technological possibilities of an inline ultrasound system as a quality control system for wet recycling of solid waste. The main targeted recycling technology is magnetic density separation (MDS), a novel technique that was investigated and technologically matured in a project...
doctoral thesis 2013
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Wagterveld, R.M. (author)
Scaling comprises the formation of hard mineral deposits on process or membrane equipment and calcium carbonate is the most common scaling salt. Especially in reverse osmosis (RO) membrane systems, scale formation has always been a serious limitation, causing flux decline, membrane degradation, loss of production and elevated operating costs. In...
doctoral thesis 2013
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Demi, L. (author)
The design and optimization of medical ultrasound modalities require a method for modeling the propagation of pressure wave fields through biomedical tissue. This method needs to be capable of modeling various phenomena, e.g. nonlinear propagation, attenuation, and scattering caused by arbitrary inhomogeneities in the acoustic properties of the...
doctoral thesis 2013
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Alles, E.J. (author)
Intravascular ultrasound (IVUS) is a medical imaging modality aimed at imaging blood vessel walls from within the vessel. Current commercial IVUS catheters are designed to yield two-dimensional cross-sectional images perpendicular to the vessel wall. By pulling the catheter back through the artery (in the ‘axial direction’), and stacking the...
doctoral thesis 2012
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